Cutters – for shaping – Including holder having seat for inserted tool – With separate means to fasten tool to holder
Patent
1997-02-21
1998-03-31
Howell, Daniel W.
Cutters, for shaping
Including holder having seat for inserted tool
With separate means to fasten tool to holder
407102, 407113, B23B 1716
Patent
active
057330735
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a cutting tool assembly and to a cutting tool bit for use therein.
Cutting tools suitable for precision cutting of grooves or profiling operations have a cutting bit with a cutting head projecting from a tool holder. In U.S. Pat. No. 1,542,007 a cutting tool with a conical bit accommodated in a socket of the tool holder is disclosed. The socket is formed by a tapered bore. The conical cutting bit has a circumferential groove, and a clamping screw engages in the groove to retain the cutting bit in its socket. The cutting bit has a circular cutting edge at the intersection of its top face and its conical side face. When the cutting edge presented to the workpiece is worn the tool bit can be revolved about its longitudinal axis to present a new cutting edge. Another cutting tool with a conical cutting bit is disclosed in U.S. Pat. No. 3,871,092. The tool bit has a bottom formed by two flat converging seating surfaces. A socket of corresponding shape is provided in the tool holder. The cutting bit is fastened to the tool holder by a top clamp engaging the planar top face of the bit.
SUMMARY OF THE INVENTION
The present invention provides a cutting tool assembly wherein the cutting bit has a cutting head freely projecting from the tool holder so that relatively deep cuts are possible without obstruction by the clamping arrangement. In accordance with the invention, the cutting tool assembly comprises a tool holder which defines an elongated seating surface with a socket on one longitudinal end, a threaded bore on the other end and a further threaded bore in an intermediate zone. The cutting tool bit has a cutting head portion and a shank adapted to be received in the socket of the tool holder. An elongated clamping member is provided which has an end portion provided with a tool engagement face. The other end portion of the clamping member is provided with an abutment face, and a preferably elongated through-hole is provided in an intermediate zone of the clamping member.
A fastening screw is adapted to extend through the hole in the clamping member and to be engaged in the corresponding threaded bore of the seating surface. An adjustment screw having a tapered head is adapted to be engaged in the threaded bore on the second longitudinal end of the seating surface. The tool bit has a side face with a circumferential groove therein. The corresponding end portion of the clamping member is adapted to engage into this groove, and the abutment face on the other end portion of the clamping member is adapted to bear on the tapered head of the adjustment screw. When the fastening screw is tightened, the clamping member is free to move both in a longitudinal direction and in the direction of the fastening screw for self-alignment between the tapered head surface of the adjustment screw and the surface of the groove in the tool bit. When the adjustment screw is rotated in a sense moving its tapered head away from the seating surface of the tool holder, the clamp is urged in a longitudinal direction towards the tool bit, thereby establishing a firm contact between the engagement face on the end portion of the clamping member and the corresponding, preferably conical surface of the groove in the tool bit.
Preferably, the clamping member has a convex projection on its side facing the seating surface of the tool holder between its end portion provided with the tool engagement face and its through hole. The convex projection bears on the seating surface of the tool holder and permits a rocking movement of the clamping member. This rocking movement of the clamping member contributes to an optimum self-alignment of the contacting faces between the clamping member on the one hand and the groove of the tool bit and the tapered head of the adjustment screw on the other hand.
In the preferred embodiment, the fastening screw has a head portion and a peripheral groove spaced from the head portion and a clip is engaged in the groove to retain the fastening screw on the c
REFERENCES:
patent: 3431801 (1969-03-01), Stassart
patent: 4414870 (1983-11-01), Peterson
patent: 4552491 (1985-11-01), Parker
patent: 5100269 (1992-03-01), Lyon et al.
Cerny Max
Zitzlaff Wolfgang
Howell Daniel W.
Kennametal Inc.
Prizzi John J.
Williams Mark
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